
Need a ribbed ruler to measure flow depth in a water pipe. Other folding rules were too big in some pipes. Even though it's a keychain, it works.

Thickness gauge CarSys DPM-816 PRO (Fe/nFe)
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Accurately Measure Angles And Levels With GemRed XVB Digital Gauge Level Box For Pipe Conduit
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Laser level Zitrek LL1V1H
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Cullaby Contour Gauge: 10 & 5 Inch Duplications For Perfect Templates Of Curved And Odd Shapes, Plus Bonus Angle Ruler & Carpenter Pen!
23 Review

Digital multimeter RGK DM-12
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π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
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π Dioxide Controller for Digital Gas Monitoring
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π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review